I opened my recently purchased TFT display today for the first time and noticed that it had a defective patch in one of the corners where the pixels seem to glow brighter than the others. I have attached a picture to show this better. Communication with the board works fine over SPI with an NodeMCU v1.0 ESP-12E module.

One weird thing was that I could only get the system to work with CS disconnected. This is fine as I only have one SPI device on the bus, but connecting CS would not allow the ESP-12E to boot even though I had it configured properly per the optimized ESP library I was using for this: https://github.com/Bodmer/TFT_eSPI.

I have attached the requested picture. I am using a nodeMCU board so the pin mapping is coming directly from the User_setup.h requirement from the TFT_espi library that is available. Pin mapping is as follows:BL - N/CSCK - D5MISO - D6MOSI - D7CS - GNDSDCS - N/SRST - D4D/C - D3VIN - 5v0GND - GND

For testing, I have tried with MISO connected/disconnected, SDCS pulled up/down, and BL connected to 5v0 with each case having all other pins as defined above. Only thing that has worked is when CS is pulled directly to GND. I reworked all the header pins to be safe and pin D8 on my nodeMCU since it was not great. Pin resistances between CS and all others are as follows:BL - 214.6 KSCK - 283 KMISO - 277.9 KMOSI - 283.6 KSDCS - 11.71 KRST - 13.88 KD/C - 13.92 KVIN - 10.01 KGND - 11.65 K

All aspects of the screen are working fine other than the CS pin issue that I mentioned. I have been able to develop my project fine with the discolored pixels but would like the final product to not have this issue.